The Heidelberg Catechism

Q. 65. Since, then, faith alone makes us share in Christ and all
his benefits, where does such faith originate?

A. The Holy Spirit creates it in our hearts by the
preaching of the holy gospel, and confirms it by the use of the holy Sacraments.

Q. 66. What are the Sacraments?

A. They are visible, holy signs and seals instituted by
God in order that by their use he may the more fully disclose and seal to us the promise
of the gospel, namely, that because of the one sacrifice of Christ accomplished on the
cross he graciously grants us the forgiveness of sins and eternal life.

Q. 67. Are both the Word and the Sacraments designed to direct our
faith to the one sacrifice of Jesus Christ on the cross as the only ground of our
salvation?

A. Yes, indeed, for the Holy Spirit teaches in the gospel
and confirms by the holy Sacraments that our whole salvation is rooted in the one
sacrifice of Christ offered for us on the cross.